The Investigators analysis of electronic primary care records has recently estimated that approximately 1.1 million smokers are admitted to English hospitals every year . Every one of these admissions represents a prime opportunity to intervene to promote smoking cessation, particularly since most smokers abstain from smoking while in hospital. Recent NICE guidance (PH48) recommends that smoking cessation interventions should be provided in routine care pathways for all smokers admitted to hospital; The Investigators earlier work (Evaluation of the impact of a systematic delivery of cessation interventions on delivery of smoking cessation in secondary care. REC Reference Number:10/H0403/34) in this Programme (RP-PG-0608-10020) has demonstrated that default delivery of cessation support to all smokers in hospital significantly increases uptake of support and doubles the proportion of smokers who quit long term. Clinical experience indicates that many smokers admitted to hospital, particularly those with an illness caused or exacerbated by smoking, are motivated not to smoke again after discharge but are also likely to be heavily dependent on smoking and in many cases are disabled by lung or heart disease, socially isolated, and socio-economically deprived. On leaving hospital, many participants returned to a home environment where smoking has been an integral part of daily life for many years. It is therefore not surprising that whilst many participants managed to stay smoke-free during their hospital stay, relapse after discharge is common.